Images are usually of two types:
Bitmaps are made up of tiny coloured squares called PIXELS (short for Picture element)
Each of these pixels are represented as a binary number. If you zoom in too much on a bitmap, it becomes blurry and pixelated because you can see the individual squares.
Vector Images are created using mathematical formulas. This means it uses lines and shapes, which can be resized without losing any quality. So, if you make a vector image bigger or smaller, it stays sharp and clear, no matter what size you choose.
Resolution is the amount of Pixels you have per inch.
Bit-depth is the amount of bits you have per pixel
Metadata is data about data. You usually see this when you look at your pictures on your phone (e.g. Location, date of pixture, resolution, file size)
